[lld] [LLD] [COFF] Pick timestamps from the SOURCE_DATE_EPOCH variable (PR #81326)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> The release notes for non-ELF ports are a barebone. @mstorsjo Do you want to find all interesting commits using `git log origin/release/17.x..origin/release/18.x -- lld/COFF`?

I did something similar already - filling in the stuff which is already there - but I only looked at the commits that I have been involved in myself, that I'm more familiar with. But I guess it would be useful to have a look through all of them - it's just a little bit more work. I'll see if I can get to it in the next few days.

https://github.com/llvm/llvm-project/pull/81326